Question

I was checking how it looks to debug an application on an actual device. Following code just changes the text of a button according to the number of times it is pressed repeatedly.

It was increasing perfectly, but as I tilted the device and it switched to landscape, the button changed its text to to initial state. I pressed again and tilted again, the value again got reset.

What is going on in background? and how to stop it?

b.setOnClickListener( new OnClickListener() {
    int i = 1;

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        // Toast.makeText(MainActivity.this, "Pressed ", Toast.LENGTH_SHORT).show();
        b.setText("press "+ i);
        i++;
    }
});

Answer 1

When you tilt the device your activity is destroyed and oncreate is called again .
You have to retain the value you want to get back when its is restarted.
There are several ways to do it .
In shortcut you can just add a flag in Activity in manifest file which is android:configchanges = “orientation”.

<activity
            android:name=".Splash"
            android:configChanges="orientation"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.NoTitleBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

Aur save your values in onPause or onBundleSaveinstance lifecycle callback methods.